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authorVladislav Zolotarov <vladz@broadcom.com>2010-12-13 06:27:10 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-16 13:15:53 -0800
commita3d22a68d752ccc1a01bb0a64dd70b7a98bf9e23 (patch)
treee51c231b29d8e285acb8196b6b893c718febd2b1 /net
parentd33e455337ea2c71d09d7f4367d6ad6dd32b6965 (diff)
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bnx2x: Take the distribution range definition out of skb_tx_hash()
Move the calcualation of the Tx hash for a given hash range into a separate function and define the skb_tx_hash(), which calculates a Tx hash for a [0; dev->real_num_tx_queues - 1] hash values range, using this function (__skb_tx_hash()). Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com> Signed-off-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index d28b3a023bb2..b25dd087f06a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2112,14 +2112,19 @@ out:
static u32 hashrnd __read_mostly;
-u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
+/*
+ * Returns a Tx hash based on the given packet descriptor a Tx queues' number
+ * to be used as a distribution range.
+ */
+u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
+ unsigned int num_tx_queues)
{
u32 hash;
if (skb_rx_queue_recorded(skb)) {
hash = skb_get_rx_queue(skb);
- while (unlikely(hash >= dev->real_num_tx_queues))
- hash -= dev->real_num_tx_queues;
+ while (unlikely(hash >= num_tx_queues))
+ hash -= num_tx_queues;
return hash;
}
@@ -2129,9 +2134,9 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
hash = (__force u16) skb->protocol ^ skb->rxhash;
hash = jhash_1word(hash, hashrnd);
- return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
+ return (u16) (((u64) hash * num_tx_queues) >> 32);
}
-EXPORT_SYMBOL(skb_tx_hash);
+EXPORT_SYMBOL(__skb_tx_hash);
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
{